These bits are designed specifically for use in undermount installations of Corian bowl #874-s. They trim and profile The counter-top edges after the bowl is mounted, #57160, diameter (D): 2-1/8, angle (a°): 17°, radius (r): 1/2, cutting Height (B): 1, shank (D): 1/2, overall length (L): 2-7/8, B1: 25/32, Type: Round over, replacement bearing: 47731, flutes: 2, a: 3/4, 57160 carbide Tipped undermount bowl Solid surface 2-1/8 dia x 1 inch x 17 Deg X 1/2 shank